"Following separate competitive bid processes, the Board approved a contract valued at $8.2 million to Ellcon National Inc. for the purchase of new auxiliary power systems that will be more efficient and reliable for the remaining years of service of the 3200-series rail cars," CTA said in a statement.

"A second contract valued at $4.1 million was awarded to Axion Technologies for the purchase of color light-emitting diode (LED) signs, which will replace the roller-curtain signs on the sides and ends of each rail car that are used to display the color of a rail line and its respective destination. The LED destination displays are brighter, provider larger text and are easier for customers to read," CTA said.

CTA employees at the Skokie (Ill.) Heavy Maintenance Facility will handle the overhaul project over a two-year period.

Earlier this month CTA said its new 7000 series cars will mimic the 3200 series in terms of seating arrangements, which include forward-facing, rear-facing, and aisle-oriented seating pairs.